Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c191a0c717cd74…

MALICIOUS

PDF

68.6 KB Created: 2020-11-22 23:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9a6fecf8a54936e6bcf6490d904bd18e SHA-1: 200abf3e2f31b3b0409b415ec95575ed06b98f39 SHA-256: e9c191a0c717cd74397dbc8ed84a9a033c7872e3a6031f8b017a7f7606a89ccf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or SEO spam campaign, as indicated by the presence of numerous external links to disposable hosting sites. The document body, though heavily obfuscated, contains keywords related to software downloads, suggesting a lure to trick users into visiting these links. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/123?utm_term=webcam+toy+download+for+windows+7 PDF link annotation
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/3982154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5fa973abbff82.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/woxewubite.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/kaxukizemupewese.pdfIn PDF document text
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/xozubitobomigawunini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f9163c7ebec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8a324fe7b84.pdfIn PDF document text
    • https://tuzatorigipixaz.weebly.com/uploads/1/3/4/3/134321964/wugajuvubivi.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/8952721.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d35d8e2-c2cf-4d39-8018-8d12fc5353ba/41685413704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16f1a15-cea2-4454-ac30-07a3e94fb69a/36189280114.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 5596 bytes
SHA-256: 0978fc300ef0a0bcb2814b7333d43687b43576b5e0e688612d44a34059c0d8d8
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10156 bytes
SHA-256: 2494b892646cdd9da91eb73ab1cf7be150883f693ef553e0aa822a2f68afbc3f

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